Mysql query is running fine in mysql workbench but not in C# coding

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mysql query is running fine in mysql workbench but not in c# coding

What I have tried:

select unitstat.unitgroup,unitstat.tagno, od.status, unitstat.totalcount as DriftCount, unitstat.implication, unitstat.operparam
                           from (
                          select om.unitcode, concat(ifnull(om.unitgroup, ''),'(',ifnull(om.shortunitdesc, ''),')') as unitgroup,oh.tagno, count(*) totalcount, oc.implication,oc.operparam
                           from oehistory oh, oeunitmaster om, oeconfig oc
                           where om.unitcode = oh.unitcode and oh.unitcode=oc.unitcode and oh.tagno=oc.tagno
                           and timestamp between str_to_date ('" + txtFromDate.Text + "', '%d-%b-%y') and str_to_date ('" + txtToDate.Text + "', '%d-%b-%y')";
            strDetails += @" group by om.unitgroup, om.unitcode, om.unitname,om.shortunitdesc, oh.tagno,oc.implication, oc.operparam
                             order by om.unitgroup, om.unitname, oh.tagno
                             ) unitstat, oedata od
                            where od.unitcode = unitstat.unitcode
                            and od.tagno = unitstat.tagno and unitstat.totalcount > 2
                            order by od.status

Posted 3-Oct-18 18:38pm

Darsh12345

Updated 3-Oct-18 20:40pm

v2

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Christian Graus 4-Oct-18 1:39am

That's your query. If it works fine, then the issue is in the C# code you didn't post.

Darsh12345 4-Oct-18 1:48am

issue is query is working fine on mysql workbench but not displaying output on .net page

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OriginalGriff · Answer 1 · 2018-10-03T20:40:00

Don't do it like that! Never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'

The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'

Which SQL sees as three separate commands:

SQL

SELECT * FROM MyTable WHERE StreetAddress = 'x';

A perfectly valid SELECT

SQL

DROP TABLE MyTable;

A perfectly valid "delete the table" command

SQL

--'

And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?